Die for die casting



- Jan. 269 1926. 1,570,669

c. A. HEINZELMAN DIE FOR DIIE CASTING Filed August 13, 1925 6 I 9 I K 7I ll x,

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Patented Jan. 26, 1926. I

UNITED STATES cnns'rna ARTHUR HEINZELMAN, or BEL EVI LE, ILLINOIS.

DIE non DIE CASTING.

Application filed August 13, 1925. Serial, No. 49,930.

To all whom it may concern:

Be it known that I, CI-IEsrnn A. I-InrNznL- AN, a citizenof the UnitedStates, and a resident of the city of Belleville, in the county of St.Clair and State of Illinois,

haveinvented a new and useful Improvement in Diesfor Die Casting, ofwhich the followingis a'specification.

My invention relates to dies for die casting and has for its principalobject a die which permits the escape of gases from the molten metal,thus preventing the formation of blow holes, and which eliminates thefins resulting from the use of dies provided with vent holes and the,like. The invention consists in providing the die with an openingthrough which extends a plunger shaped to fit the opening, but having aportion cut away, whereby escape of gases is permitted, and the fin orflashing formed by metal flowing into the space left by the cut awayportion of the plunger is automatically removed by the withdrawal of theplunger, thus leaving a casting free from fins and flashings. Theinvention further consists in the die and in the parts and combinationsof parts hereinafter described and claimed.

In the accompanying drawing, which forms part of this specification andwherein like reference characters indicate like parts wherever theyoccur,

Fig. 1 is a plan view of a die embodying my invention,

Fig. 2 is a vertical sectional view, and

Fig. 3 is a vertical sectional view of a slightly differentform of die.

In die casting metals, it is desirable to permit the escape of air andgases from the molten metal in the die in order to produce a castingthat is free from blow holes. It is common practice to provide ventholes for the escape of gases or to provide recesses or cut awayportions between the two parts of the die. Such expedients result in theformation of fins and flashings on the casting and the vent holes fillup with metal and it is very diflicult to clean out the holes after thecasting has hardened. The present in vention obviates thesedifficulties.

According to the present invention, a two part die is used comprising alower die member '1 and an upper die member 2 resting thereon, saidupper die member having a recess 3 therein of the shape desired for thefinished casting, in the present case, cylindrical. The upper die member2 is movable toward and away from the lower member 1,

and is positioned by means of rods 4 that extend through holes in saidupper member and have their lower ends threaded into the lower diemember. The lower die member 1 is"provided with an opening 5therethroughpermitting the entrance of molten metal into the spaceformed between the two die members. 1

Extending through a hole 6 in the upper die member 2 alongside of thecasting recess 3 is a plunger 7 that is shaped to fit the hole, one face8 of said plunger being shaped to conform to the shape of the castingrecess 3 and constituting a continuation of the wall of said castingrecess. A portion of the plunger is cut away, forming a ledge 9 near thetop of the casting recess and forming a passageway 10. Gases can escapethrough this opening, and a certain amount of molten metal will flowinto said opening and willharden as the metal hardens in the die.

After the metal in the die has hardened, the plunger 7 is withdrawn. Asthe plunger is shaped to fit the opening through the upper die member,the metal in the space formed by the cut away portion of said plunger issheared ofi by the action of the ledge 9 and the upper die member 2,thus leaving thecasting free from fins and flashings and of the desiredshape.

The die may be made of any desired shape and the plunger may bepositioned at any suitable place to conform to the requirements of thefinished casting. In Fig. 3 is shown a die for casting annularmembers.

The plunger 7 is located at the middle of the casting recess, thusforming a hole through the center of the casting. The withdrawal of vtheplunger cuts away the fin resulting from the flowing of metal into thecut away portion of the plunger and leaves a casting with a truecircular hole therethrough.

The above described die has great advantages; since by its use, theescape of air and gases from the molten metal in the die is permittedand the finished casting is of accurate shape and free from fins andflashings.

Obviously, numerous changes may be made without departing from theinvention and I do not wish to be limited to the precise constructionshown.

What I claim is:

' 1. A die for die casting provided with an opening therethrough and aplunger shaped to fit said opening, said plunger having a cut awayportion.

2. A die for die casting provided with an opening therethrough and aplunger shaped to fit said opening, said plunger having a cut awayportion forming a ledge near the top of said recess and an opening intosaid recess.

3. A die for die casting provided With an opening therethrough and aplunger shaped to lit said opening extending into the casting recess,said plunger having a cut away portion forming an opening into saidrecess.

4-. A die for die casting comprising upper and lower die members, saidupper member having a casting recess and being provided with an openingalongside of said recess, and

a plunger shaped to fit said opening and extending thcrethrough, saidplunger having a face shaped to form a continuation of the wall of thecasting recess and said plunger having a cut away portion.

5. A die for die casting comprising upper and lower die members, saidupper member having a casting recess and being provided with an opening,and a plunger shaped to fit said opening and extending therethrough,said plunger having a cut away portion forming a ledge on saidplunger'adjacent to the top of said casting recess, whereby an openingis formed for said recess and metal flowing into said opening is shearedoff upon the Withdrawal of said plunger.

CHESTER QLR'IHUR HEINZELMAN.

